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I'm looking to replace my Honeywell IAQ (not prestige) with an Ecobee3. My system is a Trane 2.5t XL15i (4TWX5030B1), and the air handler is a 4TEE3F39A1 (variable speed fan) with a 10KW Aux heat electric strip. The IAQ also provides dehumidification via overcool.
Currently I have just the single IAQ thermostat, so it's only got 3 wires hooked up. Thankfully when my system was installed, they ran a full 10 wires between the air handler and the thermostat, just left most unhooked.
I understand I have to remove the EIM from the system, and wire the Ecobee3 directly to the air handler, but I'm not 100% sure how to do this. Obviously red and blue are easy, as are probably the other main wires, but I'm not clear on things like dehumidification, etc. I saw somewhere someone commenting about their air handler having an ACC+ terminal, but I'm not sure mine does.
Also, and this is key, I have the IAQ set to run the fan all the time to keep air circulating, but since the air handler is variable, the fan runs at a lower speed. Is this is IAQ that does this speed control, or is it the air handler? I would rather not lose this circulation or have the fan run at full blast all the time. =/
Any help would be greatly appreciated.